A rotary cleaning head for a cleaning machine for a floor, wherein said rotary cleaning head is operable to receive a vacuum from a source of vacuum, to receive a cleaning fluid from a source of cleaning fluid, and to receive rotation from a source of rotary power;
- wherein said rotary cleaning head has an axis of rotation;
- and wherein said rotary cleaning head comprises:
- a drive spindle, a vacuum distribution hub;
- a vacuum channel;
- a main disc having an upper surface and a lower surface;
- a main disc cover having an upper surface and a lower surface;
- and a main disc seal operable to provide a seal between said main disc and said main disc cover;
- wherein said main disc, said main disc cover and said main disc seal rotate about said axis of rotation during operation of said rotary cleaning head;
- wherein said drive spindle comprises a bore;
- and wherein said bore is operable to receive said cleaning fluid from said source of cleaning fluid;
- wherein said drive spindle is operable to receive said rotation from said source of rotary power;
- wherein said drive spindle is not operable to receive said vacuum from said source of vacuum;
- and wherein said drive spindle is not operable to convey said vacuum from said source of vacuum to said vacuum distribution hub;
- wherein said vacuum distribution hub and said vacuum channel are in fluid communication with each other and are located between at least a portion of said upper surface of said main disc and said lower surface of said main disc cover;
- wherein said vacuum distribution hub rotates about said axis of rotation during operation of said rotary cleaning head;
- and wherein said vacuum channel extends outwardly, away from said axis of rotation, and rotates about said axis of rotation during operation of said rotary cleaning head;
- wherein said main disc further comprises a main disc vacuum port;
- wherein said main disc vacuum port extends through said lower surface of said main disc and is in fluid communication with said vacuum channel;
- and wherein said main disc vacuum port rotates about said axis of rotation during operation of said rotary cleaning head;
- wherein said main disc cover comprises a vacuum opening;
- wherein said vacuum opening extends through said upper surface of said main disc cover;
- wherein said vacuum opening is in fluid communication with said vacuum distribution hub and is operable to be connected to said source of vacuum;
- wherein said vacuum opening rotates about said axis of rotation during operation of said rotary cleaning head;
- and
- wherein, despite said rotation of said rotary cleaning head, said rotary cleaning head is operable to provide a continuity of vacuum from said source of vacuum to said main disc vacuum port via said vacuum opening in said main disc cover, said vacuum distribution hub, and said vacuum channel.